Damage evaluation of fossil fuelled power plant boiler tubes through magnetic Barkhausen technique

Roy, Rajat K and Das, Swapan K and Srivastava, Abhinav and Panda, A K and Mitra, A (2014) Damage evaluation of fossil fuelled power plant boiler tubes through magnetic Barkhausen technique. Engineering Failure Analysis, 44 (IF-1.130). pp. 195-201.

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The failure mechanism of two economizer tubes of a fossil fuelled 260MWpower plant has been investigated through the magnetic Barkhausen emission (MBE) technique along with the conventional and established materials characterization and evaluation techniques (like microstructures, mechanical properties and X-ray diffraction). The longer service exposer period results in the breaking of ferrite–pearlite structure and spheroidization lamellar cementite in ferrite matrix, associating with high magnetic r.m.s. voltage for former structure. The failure mechanism was governed by the cold end corrosion process with the presence of sulfates, and the subsequent erosion through hard quartz particles leads to a localized thinning of outer surface. Accordingly, the hoop stress was operative in tube walls and failed through fish-mouth opening. The MBE r.m.s. voltage response and pulse height distribution throw light on microstructural changes with duration of service exposure as well as leaked and non-leaked regions of economizer tubes.

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.engfailanal.2014.05.01...
Uncontrolled Keywords:Barkhausen; Pulse height distribution; r.m.s. Voltage Economizer tube; Hoop stress
Divisions:Material Science and Technology
ID Code:6953
Deposited By:Dr Rajat Roy
Deposited On:23 Jun 2014 11:02
Last Modified:04 May 2016 14:51
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